President Barack Obama has had the weight of the free world on his shoulders for 2½ years, and he might be starting to look like it.
At 50, which he turns Thursday, his hair is a little grayer, and his face and neck are a little more creased, than on the day he took office in January 2009.
You'd expect some of that - he is older. But Obama, like his predecessors, has had plenty to do. He's waged battles over economic stimulus, health care and the debt ceiling. He's juggled wars in Iraq and Afghanistan; he committed to a campaign over Libya's skies; he chased Osama bin Laden; and he dealt with a massive oil disaster off the Gulf Coast.
It's tempting to think the office makes presidents look older than they are. The George W. Bush who left office in 2009 was not the youthful Bush before 9/11. Bill Clinton's hair was significantly whiter and his eyes baggier after eight years.
Dr. Michael Roizen holds on to what he's said for a while: That presidents effectively age twice as fast while in office.FULL STORY